水平荷载作用下填充墙高度对RC框架结构受力性能影响的非线性分析

采用ANSYS软件对3个单层单跨开洞率不同的填充墙钢筋混凝土框架水平荷载试验模型进行了非线性分析,由分析结果可得计算值与试验结果吻合良好。用同样的模拟方法,对5个单层双跨不同填充墙高度的钢筋混凝土框架模型进行了水平荷载作用下的全过程模拟分析。研究结果表明,随着填充墙高度的增大,填充墙框架结构侧移刚度和水平承载力显著提高,结构延性相对降低;框架结构开裂荷载有所提高,但框架柱原有的"强剪弱弯"性能可能改变,出现箍筋先于纵筋屈服的不利情况;框架柱上段剪力值比原纯框架柱有明显增大,各跨墙高不等时,增幅更大;按照现行结构设计方法,框架柱正截面和框架梁弯、剪承载力设计是安全的,但是框架柱斜截面抗剪承载力的设计存在极大的安全隐患。

Nonlinear analysis on influence of the height of infilled wall on the mechanical behaviors of RC framework under the horizontal load

ANSYS software was used to do nonlinear analysis towards three monolayer single span reinforced concrete frame horizontal load test models with different open hole rate,and the calculation results have good agreement with the experimental results.Then the same analogy method was used to analyze five monolayer double span rate reinforced concrete frames with different infilled wall height,and simulate the whole process under horizontal load.The results show that with the increase of infilled wall height,the infilled wall frame structure lateral stiffness and horizontal bearing capacity increase significantly,and structure ductility becomes relatively lower;Frame structure crack load increases,but the original frame column ’strong shear weak bending’ performance may change and appear the situation that stirrup is more easily yield than longitudinal reinforcement;Shear value of upper part of frame column becomes bigger than the original pure frame column,when every height is different,the increase is more significant;According to the current structure design method,the frame column normal section and frame beams bending,shear capacity design are safe,but inclined section shear capacity design of frame column exists a great potential safety hazard.